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The role of surface flaws in competitive photoanodic processes at TiO2electrodes

Authors
Journal
Journal of Electroanalytical Chemistry
0022-0728
Publisher
Elsevier
Publication Date
Volume
138
Issue
1
Identifiers
DOI: 10.1016/0022-0728(82)87132-5
Disciplines
  • Chemistry

Abstract

Abstract The effects of flaws in the electrode surface of TiO 2 on photoelectrochemical reactions were investigated by using electrodes having different physical conditions of flaws for the anodic oxidation of several reducing agents such as Fe(CN) 6 4−, I −, Br − and Cl − which occur in competition with the oxidation of water. The current efficiency for the oxidation of reducing agents at flaw-free electrodes showed no potential dependence, but when there were flaws in the electrode surface, it showed a peculiar potential dependence; the current efficiency, starting from the value observed at the flaw-free electrodes, decreased with an increase in anodic potential up to a certain critical potential beyond which the potential dependence disappeared. Lattice defects existing on the surface rather than in the surface interior seem to be responsible for the phenomena observed. The results are discussed from the viewpoint of the different behavior of surface hydroxyl radicals involved in the electrode reaction.

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